Update test data for 8.0 SDK

src/Microsoft.DotNet.Installer.Windows.Security.TestData/TestData/readme.md

@@ -1,14 +1,21 @@
+## BootstrapperCore.dll
 
-## triple_signed.dll
+WiX binary, signed by .NET Foundation, terminates in a non-Microsoft root (DigiCert).
 
-This file contains 3 Microsoft AuthentiCode signatures and is used to verify CryptQueryObject implementations to
-construct SignedCms objects and extract nested signatures.
+## dotnet_realsigned.exe
+
+.NET host executable, signed with the .NET Authenticode certificate, trusted Microsoft root.
 
 ## dual_signed.dll
 
-This file is dual signed with the .NET Foundation and Microsoft 3rd Party Application SHA2 certificates. It's used to
-test some of the CLI installer logic to verify trusted origanizations.
+This file is dual signed with the .NET Foundation and Microsoft 3rd Party Application SHA2 certificates. 
+
+## System.Web.Mvc.dll
+
+SHA1 signed assembly - valid authenticode, but no longer a trusted Microsoft trusted root.
 
 ## tampered.msi
 
-Signed MSI from .NET Runtime, edited in Orca to change the ProductName in the Properties table which should have invalidated the signature.
+Signed MSI from .NET Runtime, edited in Orca to change the ProductName in the Properties table to invalidate the signature.
+
+